branchcache: add a "pure topological head" fast path
In a narrow but actually quick common case, all topological heads are all on
the same branch and all open. In this case, computing the branch map is very
simple. We can quickly detect situation where this situation will not change.
So we update the V3 format to be able to express this situation and upgrade the
update code to detect we remains in that mode.
The branch cache is populated with the actual value when the branch map is
accessed, but the update_disk method can do the update without needing to
populate it.
===============================================
Testing merge involving change to the exec flag
===============================================
#require execbit
Initial setup
==============
$ hg init base-repo
$ cd base-repo
$ cat << EOF > a
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> 8
> 9
> EOF
$ touch b
$ hg add a b
$ hg commit -m "initial commit"
$ cd ..
$ hg init base-exec
$ cd base-exec
$ cat << EOF > a
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> 8
> 9
> EOF
$ chmod +x a
$ touch b
$ hg add a b
$ hg commit -m "initial commit"
$ cd ..
Testing merging mode change
===========================
Adding the flag
---------------
setup
Change on one side, executable bit on the other
$ hg clone base-repo simple-merge-repo
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd simple-merge-repo
$ chmod +x a
$ hg ci -m "make a executable, no change"
$ [ -x a ] || echo "executable bit not recorded"
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cat << EOF > a
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> x
> 9
> EOF
$ hg commit -m "edit end of file"
created new head
merge them (from the update side)
$ hg merge 'desc("make a executable, no change")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st
M a
$ [ -x a ] || echo "executable bit lost"
merge them (from the chmod side)
$ hg up -C 'desc("make a executable, no change")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg merge 'desc("edit end of file")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st
M a
$ [ -x a ] || echo "executable bit lost"
$ cd ..
Removing the flag
-----------------
Change on one side, executable bit on the other
$ hg clone base-exec simple-merge-repo-removal
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd simple-merge-repo-removal
$ chmod -x a
$ hg ci -m "make a non-executable, no change"
$ [ -x a ] && echo "executable bit not removed"
[1]
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cat << EOF > a
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> x
> 9
> EOF
$ hg commit -m "edit end of file"
created new head
merge them (from the update side)
$ hg merge 'desc("make a non-executable, no change")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st
M a
$ [ -x a ] && echo "executable bit not removed"
[1]
merge them (from the chmod side)
$ hg up -C 'desc("make a non-executable, no change")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg merge 'desc("edit end of file")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st
M a
$ [ -x a ] && echo "executable bit not removed"
[1]
$ cd ..
Testing merging mode change with rename
=======================================
Adding the flag
---------------
$ hg clone base-repo rename-merge-repo
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd rename-merge-repo
make "a" executable on one side
$ chmod +x a
$ hg status
M a
$ hg ci -m "make a executable"
$ [ -x a ] || echo "executable bit not recorded"
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
make "a" renamed on the other side
$ hg mv a z
$ hg st --copies
A z
a
R a
$ hg ci -m "rename a to z"
created new head
merge them (from the rename side)
$ hg merge 'desc("make a executable")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
$ [ -x z ] || echo "executable bit lost"
merge them (from the chmod side)
$ hg up -C 'desc("make a executable")'
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge 'desc("rename a to z")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
R a
$ [ -x z ] || echo "executable bit lost"
$ cd ..
Removing the flag
-----------------
$ hg clone base-exec rename-merge-repo-removal
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd rename-merge-repo-removal
make "a" non-executable on one side
$ chmod -x a
$ hg status
M a
$ hg ci -m "make a non-executable"
$ [ -x a ] && echo "executable bit not removed"
[1]
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
make "a" renamed on the other side
$ hg mv a z
$ hg st --copies
A z
a
R a
$ hg ci -m "rename a to z"
created new head
merge them (from the rename side)
$ hg merge 'desc("make a non-executable")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
$ [ -x z ] && echo "executable bit not removed"
[1]
merge them (from the chmod side)
$ hg up -C 'desc("make a non-executable")'
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge 'desc("rename a to z")'
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
R a
$ [ -x z ] && echo "executable bit not removed"
[1]
$ cd ..
Testing merging mode change with rename + modification on both side
===================================================================
Adding the flag
---------------
$ hg clone base-repo rename+mod-merge-repo
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd rename+mod-merge-repo
make "a" executable on one side
$ chmod +x a
$ cat << EOF > a
> 1
> x
> 3
> 4
> 5
> 6
> 7
> 8
> 9
> EOF
$ hg status
M a
$ hg ci -m "make a executable, and change start"
$ [ -x a ] || echo "executable bit not recorded"
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
make "a" renamed on the other side
$ hg mv a z
$ hg st --copies
A z
a
R a
$ cat << EOF > z
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> x
> 9
> EOF
$ hg ci -m "rename a to z, and change end"
created new head
merge them (from the rename side)
$ hg merge 'desc("make a executable")'
merging z and a to z
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
$ [ -x z ] || echo "executable bit lost"
merge them (from the chmod side)
$ hg up -C 'desc("make a executable")'
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge 'desc("rename a to z")'
merging a and z to z
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
R a
$ [ -x z ] || echo "executable bit lost"
$ cd ..
Removing the flag
-----------------
$ hg clone base-exec rename+mod-merge-repo-removal
updating to branch default
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ cd rename+mod-merge-repo-removal
make "a" non-executable on one side
$ chmod -x a
$ cat << EOF > a
> 1
> x
> 3
> 4
> 5
> 6
> 7
> 8
> 9
> EOF
$ hg status
M a
$ hg ci -m "make a non-executable, and change start"
$ [ -x z ] && echo "executable bit not removed"
[1]
$ hg up ".^"
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
make "a" renamed on the other side
$ hg mv a z
$ hg st --copies
A z
a
R a
$ cat << EOF > z
> 1
> 2
> 3
> 4
> 5
> 6
> 7
> x
> 9
> EOF
$ hg ci -m "rename a to z, and change end"
created new head
merge them (from the rename side)
$ hg merge 'desc("make a non-executable")'
merging z and a to z
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
$ [ -x z ] && echo "executable bit not removed"
[1]
merge them (from the chmod side)
$ hg up -C 'desc("make a non-executable")'
1 files updated, 0 files merged, 1 files removed, 0 files unresolved
$ hg merge 'desc("rename a to z")'
merging a and z to z
0 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg st --copies
M z
a
R a
$ [ -x z ] && echo "executable bit not removed"
[1]
$ cd ..